There are many emerging protocols around agents. Model Context Protocol (MCP) standardizes how models and agents access external tools and resources. Agent2Agent Protocol (A2A) defines how agents running on diverse frameworks and platforms communicate. Agent to User Interface Protocol (A2UI) defines how agents generate UI and Agent-User Interaction Protocol (AG-UI) defines how agents communicate with frontends. In this session, we’ll deep-dive into each protocol and show how they complement each other. As a bonus, we’ll also see demos on how to use these protocols in agent frameworks such as Agent Development Kit (ADK) to give you practical knowledge to start building your own interoperable agents.